-
Safety and Protection
Low-voltage circuit breakers offer automatic disconnection in case of overload or short circuits, preventing damage and fires.
All three components contribute to a safer electrical environment, protecting both property and individuals. -
Reliability and Stability
Integrated protection functions in circuit breakers, such as leakage and overvoltage protection, enhance the reliability of electrical systems.
Surge protectors improve the stability of critical equipment and systems by reducing the impact of voltage fluctuations. -
Efficiency and Energy Conservation
Prompt disconnection of overloaded circuits by circuit breakers helps in saving energy and reducing waste.
-
Maintenance and Cost Reduction
The ease of maintenance of low-voltage circuit breakers reduces service costs and downtime.
-
How do I select the right ACB for my application?
1.Rated Current (In):
Select based on load calculated current, with 20%–30% margin (e.g., for 800A load, choose 1000A or 1250A).
2.Breaking Capacity (Icu/Ics):
Must exceed the system’s maximum short-circuit current (e.g., for 50kA system short circuit, choose ACB with Icu ≥65kA).
3.Poles:
3-pole for three-phase three-wire systems; 4-pole for three-phase four-wire systems (when neutral disconnection is required).
4.Protection Functions:
Basic: Overload + short-circuit protection.
Intelligent: Adds ground fault, undervoltage, overvoltage, single-phase earth fault protection. -
What should I do if the ACB trips and stops supplying power?
1.Identify the cause first:
Check the ACB panel for alarm indicators (e.g., overload, short circuit, ground fault).
Inspect connected equipment for abnormalities (smoke, odor, noise).
Do not reclose immediately: Blind reclosing may worsen the fault or cause repeated tripping.
2.Reset after troubleshooting:
For overload trips, reduce load or stagger equipment startup.
For short circuits or ground faults, repair wiring or faulty equipment.
After confirming the fault is cleared, move the handle from “TRIP” to “OFF,” then to “ON.” -
Does an ACB require regular maintenance?
1.Every 1–2 years:
Inspect contact wear (contact resistance test).
Clean arc chutes and insulation components (prevent dust-induced insulation failure).
Lubricate mechanical parts (e.g., handles, linkages).
2.Every 3–5 years:
Calibrate trip unit settings (e.g., overload long delay, short-circuit instantaneous).
Check secondary circuit connections for looseness.
3.Precautions:
Cut off power and post warning signs before maintenance.
Do not disassemble intelligent controllers or core mechanical parts without professional training.
